Skip bad cookies in http headers.

sdk/lib/io/http_headers.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of dart.io;
 
 class _HttpHeaders implements HttpHeaders {
   final Map<String, List<String>> _headers;
   final String protocolVersion;
 
@@ skipping 426 matching lines @@
     });
     return sb.toString();
   }
 
   List<Cookie> _parseCookies() {
     // Parse a Cookie header value according to the rules in RFC 6265.
     var cookies = new List<Cookie>();
     void parseCookieString(String s) {
       int index = 0;
 
-      bool done() => index == s.length;
+      bool done() => index == -1 || index == s.length;
 
       void skipWS() {
         while (!done()) {
          if (s[index] != " " && s[index] != "\t") return;
          index++;
         }
       }
 
       String parseName() {
         int start = index;
         while (!done()) {
           if (s[index] == " " || s[index] == "\t" || s[index] == "=") break;
           index++;
         }
         return s.substring(start, index);
       }
 
       String parseValue() {
         int start = index;
         while (!done()) {
           if (s[index] == " " || s[index] == "\t" || s[index] == ";") break;
           index++;
         }
         return s.substring(start, index);
       }
 
-      void expect(String expected) {
-        if (done()) {
-          throw new HttpException("Failed to parse header value [$s]");
-        }
-        if (s[index] != expected) {
-          throw new HttpException("Failed to parse header value [$s]");
-        }
+      bool expect(String expected) {
+        if (done()) return false;
+        if (s[index] != expected) return false;
         index++;
+        return true;
       }
 
       while (!done()) {
         skipWS();
         if (done()) return;
         String name = parseName();
         skipWS();
-        expect("=");
+        if (!expect("=")) {
+          index = s.indexOf(';', index);
+          continue;
+        }
         skipWS();
         String value = parseValue();
         cookies.add(new _Cookie(name, value));
         skipWS();
         if (done()) return;
-        expect(";");
+        if (!expect(";")) {
+          index = s.indexOf(';', index);
+          continue;
+        }
       }
     }
     List<String> values = _headers[HttpHeaders.COOKIE];
     if (values != null) {
       values.forEach((headerValue) => parseCookieString(headerValue));
     }
     return cookies;
   }
 }
 
@@ skipping 340 matching lines @@
   void clear() {
     throw new UnsupportedError("Cannot modify an unmodifiable map");
   }
   void forEach(void f(K key, V value)) => _map.forEach(f);
   Iterable<K> get keys => _map.keys;
   Iterable<V> get values => _map.values;
   int get length => _map.length;
   bool get isEmpty => _map.isEmpty;
   bool get isNotEmpty => _map.isNotEmpty;
 }